Example for Configuring IPv6 PIM-SM Intra-domain Multicast

This section provides an example for configuring basic PIM-SM functions for an IPv6 PIM-SM domain.

Networking Requirements

On the ISP network shown in Figure 1, multicast services are deployed. An Interior Gateway Protocol (IGP) has been deployed on the network, IPv6 unicast is running properly, and the network has been connected to the Internet. It is required that hosts receive VoD information in multicast mode.

Figure 1 Configuring IPv6 PIM-SM intra-domain multicast

Interfaces 1, 2, 3, and 4 in this example represent GE 0/1/0, GE 0/1/8, GE 0/1/16, and GE 0/1/1, respectively.

Precautions

When configuring IPv6 PIM-SM intra-domain multicast, note the following precautions:

IPv6 PIM-SM must be enabled before Multicast Listener Discovery (MLD) is enabled.
To use a static Rendezvous Point (RP), configure the same RP address on all routers.
Use the Protocol Independent Multicast - Source-specific Multicast (PIM-SSM) service when the users need to receive data from a specified multicast source. Ensure that all routers share the same SSM group address range.

Configuration Roadmap

The configuration roadmap is as follows:

Configure an IPv6 address for each router interface and an IPv6 unicast routing protocol.
Enable IPv6 multicast routing on all routers.
Enable IPv6 PIM-SM on all router interfaces.
Enable MLD on interfaces that directly connect routers to hosts.
Configure an RP. An RP is a rendezvous point tree (RPT)'s root node on a PIM-SM network. Setting an RP on the router that has more multicast flows is recommended.
(Optional) Set a BootStrap router (BSR) boundary on interfaces connected to the Internet. Bootstrap messages cannot pass through the BSR boundary. Therefore, the BSR serves only this PIM-SM domain. This improves multicast controllability.
(Optional) Configure the same SSM group address range on each router. This enables the multicast routers in the PIM-SM domain to provide services only for multicast groups with addresses being in the SSM group address range.

Data Preparation

To complete the configuration, you need the following data:

Multicast group address
Multicast source address
SSM group address range

Procedure

Configure an IPv6 address for each router interface and an IPv6 unicast routing protocol. For configuration details, see Configuration Files in this section.

Enable IPv6 multicast routing on each router and enable IPv6 PIM-SM on each interface on the routers.

# Configure DeviceA. The configurations of DeviceB, DeviceC, and DeviceD are similar to the configuration of DeviceA. For configuration details, see Configuration Files in this section.

[~DeviceA] multicast ipv6 routing-enable
[*DeviceA] interface gigabitethernet 0/1/0
[*DeviceA-GigabitEthernet0/1/0] pim ipv6 sm
[*DeviceA-GigabitEthernet0/1/0] quit
[*DeviceA] interface GigabitEthernet 0/1/8
[*DeviceA-GigabitEthernet0/1/8] pim ipv6 sm
[*DeviceA-GigabitEthernet0/1/8] quit
[*DeviceA] interface GigabitEthernet 0/1/16
[*DeviceA-GigabitEthernet0/1/16] pim ipv6 sm
[*DeviceA-GigabitEthernet0/1/16] quit
[*DeviceA] interface GigabitEthernet 0/1/1
[*DeviceA-GigabitEthernet0/1/1] pim ipv6 sm
[*DeviceE-GigabitEthernet0/1/1] commit
[~DeviceE-GigabitEthernet0/1/1] quit

# Run the display pim ipv6 interface command to check IPv6 PIM interfaces on each router. The following example uses the command output on DeviceB.

<DeviceB> display pim ipv6 interface
 VPN-Instance: public net
 Interface           State NbrCnt HelloInt   DR-Pri     DR-Address
 GE0/1/0             up    1      30         1          FE80::A01:10E:1 (local)
 GE0/1/8             up    0      30         1          FE80::200:AFF:FE01:10E (local)
 GE0/1/16             up    1      30         1          FE80::9D62:0:FDC5:2

Enable MLD on the interfaces connected to hosts.
# The configuration of DeviceC is similar to the configuration of DeviceB. For configuration details, see Configuration Files in this section.
```
[~DeviceB] interface gigabitethernet 0/1/8
[~DeviceB-GigabitEthernet0/1/8] mld enable
[*DeviceB-GigabitEthernet0/1/8] commit
[~DeviceB-GigabitEthernet0/1/8] quit
```

Configure RPs.

You can configure both a static RP and a BSR RP, or only one of them. When both a static RP and a BSR RP are configured, the BSR RP is used by default. To use the static RP, specify preferred in the static-rp rp-address command.

The following shows how to configure a BSR RP

# Configure a BSR RP. Perform the following configurations on one or several routers in the PIM-SM domain. For example, on DeviceD, set the range of groups severed by the RP and addresses of C-BSRs and C-RPs.

[~DeviceD] acl ipv6 number 2001
[*DeviceD-acl6-basic-2001] rule permit source ff3e::1 64
[*DeviceD-acl6-basic-2001] quit
[*DeviceD] pim-ipv6
[*DeviceD-pim6] c-rp 2001:db8:3::2 group-policy 2001

# Configure a C-BSR on DeviceD.

[*DeviceD-pim6] c-bsr 2001:db8:3::2
[*DeviceD-pim6] commit
[~DeviceD-pim6] quit

# Run the display pim ipv6 bsr-info command to check BSR information on each router. The following examples use the command outputs on DeviceB and DeviceD (C-BSR information is also displayed on DeviceD).

<DeviceB> display pim ipv6 bsr-info
VPN-Instance: public net
 Elected AdminScope BSR Count: 0
 Elected BSR Address: 2001:db8:3::2
     Priority: 0
     Hash mask length: 126
     State: Accept Preferred
     Uptime: 00:04:22
     Expires: 00:01:46
     C-RP Count: 1
<DeviceD> display pim ipv6 bsr-info
VPN-Instance: public net
 Elected AdminScope BSR Count: 0
 Elected BSR Address: 2001:db8:3::2
     Priority: 0
     Hash mask length: 126
     State: Elected
     Uptime: 00:01:10
     Next BSR message scheduled at: 00:00:48
     C-RP Count: 1
 Candidate AdminScope BSR Count: 0
 Candidate BSR Address: 2001:db8:3::2
     Priority: 0
     Hash mask length: 126
     State: Elected
     Wait to be BSR: 0

# Run the display pim ipv6 rp-info command to check RP information on each router. The following example uses the command output on Device B.

<DeviceB> display pim ipv6 rp-info
VPN-Instance: public net
 PIM-SM BSR RP information:
 Group/MaskLen: FF3E::1/64
     RP: 2001:db8:3::2
     Priority: 192
     Uptime: 00:05:19
     Expires: 00:02:11

(Optional) Configure a BSR boundary on the interface that connects Device A to the Internet.

[~DeviceA] interface GigabitEthernet 0/1/1
[~DeviceA-GigabitEthernet0/1/1] pim ipv6 bsr-boundary
[*DeviceA-GigabitEthernet0/1/1] commit
[~DeviceA-GigabitEthernet0/1/1] quit

(Optional) Configure the SSM group address range.
# Configure the SSM group address range to FF3E::1/64 on Device A.

The configurations of Device B, Device C, and Device D are similar to the configuration of Device A. For configuration details, see Configuration Files in this section.
```
[~DeviceA] acl ipv6 2000
[*DeviceA-acl6-basic-2000] rule permit source FF3E::1 64
[*DeviceA-acl6-basic-2000] quit
[*DeviceA] pim-ipv6
[*DeviceA-pim6] ssm-policy 2000
[*DeviceA-pim6] commit
[~DeviceA-pim6] quit
```

Verify the configuration.

# Have the multicast source S (2001:db8:5::5) send multicast packets to multicast group FF3E::1 (within the SSM group address range) and multicast group FF0E::1 (beyond the SSM group address range). Have Host A and Host C receive information of multicast group FF0E::1. Have Host B receive multicast information sent by S (2001:db8:5::5) to multicast group FF3E::1. Then, run the display pim ipv6 routing-table command to check the IPv6 PIM routing table on each router.

<DeviceA> display pim ipv6 routing-table
VPN-Instance: public net
 Total 0 (*, G) entry; 2 (S, G) entries
 (2001:db8:5::5, FF0E::1)
     RP: 2001:db8:3::2
     Protocol: pim-sm, Flag: SPT LOC ACT
     UpTime: 00:02:15
     Upstream interface: GigabitEthernet0/1/0, Refresh time: 00:02:15
         Upstream neighbor: NULL
         RPF prime neighbor: NULL
     Downstream interface(s) information:
     Total number of downstreams: 3
         1: Register
             Protocol: pim-sm, UpTime: 00:02:15, Expires:  -
         2: GigabitEthernet0/1/8
             Protocol: pim-sm, UpTime: 00:02:15, Expires: 00:03:15
         3: GigabitEthernet0/1/16
             Protocol: pim-sm, UpTime: 00:02:15, Expires: 00:03:15
(2001:db8:5::5, FF3E::1)
     Protocol: pim-ssm, Flag: LOC SG_RCVR
     UpTime: 00:00:11
     Upstream interface: GigabitEthernet0/1/0, Refresh time: 00:00:11
         Upstream neighbor: NULL
         RPF prime neighbor: NULL
     Downstream interface(s) information:
     Total number of downstreams: 1
         1: GigabitEthernet0/1/8
             Protocol: pim-ssm, UpTime: 00:00:11, Expires: 00:03:19
<DeviceB> display pim ipv6 routing-table
VPN-Instance: public net
 Total 1 (*, G) entry; 2 (S, G) entries
 (*, FF0E::1)
     RP: 2001:db8:3::2
     Protocol: pim-sm, Flag: WC
     UpTime: 00:14:44
     Upstream interface: GigabitEthernet0/1/16, Refresh time: 00:14:44
         Upstream neighbor: FE80::9D62:0:FDC5:2
         RPF prime neighbor: FE80::9D62:0:FDC5:2
     Downstream interface(s) information:
     Total number of downstreams: 1
         1: GigabitEthernet0/1/8
             Protocol: mld, UpTime: 00:14:44, Expires: -
(2001:db8:5::5, FF0E::1)
     RP: 2001:db8:3::2
     Protocol: pim-sm, Flag: SPT ACT
     UpTime: 00:02:42
     Upstream interface: GigabitEthernet0/1/0, Refresh time: 00:02:42
         Upstream neighbor: FE80::A01:10C:1
         RPF prime neighbor: FE80::A01:10C:1
     Downstream interface(s) information:
     Total number of downstreams: 1
         1: GigabitEthernet0/1/8
             Protocol: pim-sm, UpTime: 00:14:44, Expires: -
(2001:db8:5::5, FF3E::1)
     Protocol: pim-ssm, Flag: SG_RCVR
     UpTime: 00:08:02
     Upstream interface: GigabitEthernet0/1/0, Refresh time: 00:08:02
         Upstream neighbor: FE80::A01:10C:1
         RPF prime neighbor: FE80::A01:10C:1
     Downstream interface(s) information:
     Total number of downstreams: 1
         1: GigabitEthernet0/1/8
             Protocol: pim-ssm, UpTime: 00:08:02, Expires: -
<DeviceC> display pim ipv6 routing-table
VPN-Instance: public net
 Total 1 (*, G) entry; 1 (S, G) entry
 (*, FF0E::1)
     RP: 2001:db8:3::2
     Protocol: pim-sm, Flag: WC
     UpTime: 00:14:44
     Upstream interface: GigabitEthernet0/1/0, Refresh time: 00:14:44
         Upstream neighbor: FE80::7493:FE25:1
         RPF prime neighbor: FE80::7493:FE25:1
     Downstream interface(s) information:
     Total number of downstreams: 1
         1: GigabitEthernet0/1/8
             Protocol: mld, UpTime: 00:14:43, Expires: -
(2001:db8:5::5, FF0E::1)
     RP: 2001:db8:3::2
     Protocol: pim-sm, Flag: SPT ACT
     UpTime: 00:02:42
      Upstream interface: GigabitEthernet0/1/0, Refresh time: 00:02:42
         Upstream neighbor: FE80::7493:FE25:1
         RPF prime neighbor: FE80::7493:FE25:1
     Downstream interface(s) information:
     Total number of downstreams: 1
         1: GigabitEthernet0/1/8
             Protocol: pim-sm, UpTime: 00:02:14, Expires: -
<DeviceD> display pim ipv6 routing-table
VPN-Instance: public net
 Total 1 (*, G) entry; 1 (S, G) entry
 (*, FF0E::1)
     RP: 2001:db8:3::2 (local)
     Protocol: pim-sm, Flag: WC
     UpTime: 00:16:56
     Upstream interface: Register, Refresh time: 00:16:56
         Upstream neighbor: NULL
         RPF prime neighbor: NULL
     Downstream interface(s) information:
     Total number of downstreams: 2
         1: GigabitEthernet0/1/8
             Protocol: pim-sm, UpTime: 00:16:56, Expires: 00:02:34
         2: GigabitEthernet0/1/16
             Protocol: pim-sm, UpTime: 00:07:56, Expires: 00:02:35
 (2001:db8:5::5, FF0E::1)
     RP: 2001:db8:3::2 (local)
     Protocol: pim-sm, Flag: SWT ACT
     UpTime: 00:02:54
     Upstream interface: GigabitEthernet0/1/0, Refresh time: 00:02:54
         Upstream neighbor: FE81::659:10C:3
         RPF prime neighbor: FE81::659:10C:3
     Downstream interface(s) information:
     Total number of downstreams: 1
            1: GigabitEthernet0/1/16
             Protocol: pim-sm, UpTime: 00:02:54, Expires: 00:02:36

Configuration Files

DeviceA configuration file

#
sysname DeviceA
#
multicast ipv6 routing-enable
#
acl ipv6 number 2000
 rule 0 permit source FF3E::1/64
#
interface GigabitEthernet0/1/0
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:5::1/64
 pim ipv6 sm
 ospfv3 1 area 0.0.0.0
#
interface GigabitEthernet0/1/8
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:1::1/64
 pim ipv6 sm
 ospfv3 1 area 0.0.0.0
#
interface GigabitEthernet0/1/16
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:2::1/64
 pim ipv6 sm
 ospfv3 1 area 0.0.0.0
#
interface GigabitEthernet0/1/1
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:6::1/64
 pim ipv6 bsr-boundary
 pim ipv6 sm
 ospfv3 1 area 0.0.0.0
#
ospfv3 1
 router-id 1.1.1.1
 area 0.0.0.0
#
pim-ipv6
 ssm-policy 2000
#
return

DeviceB configuration file

#
sysname DeviceB
#
multicast ipv6 routing-enable
#
acl ipv6 number 2000
 rule 0 permit source FF3E::1/64
#
interface GigabitEthernet0/1/0
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:1::2/64
 pim ipv6 sm
 ospfv3 1 area 0.0.0.0
#
interface GigabitEthernet0/1/8
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:7::1/64
 pim ipv6 sm
 mld enable
 ospfv3 1 area 0.0.0.0
#
interface GigabitEthernet0/1/16
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:3::1/64
 pim ipv6 sm
 ospfv3 1 area 0.0.0.0
#
ospfv3 1
 router-id 2.2.2.2
 area 0.0.0.0
#
pim-ipv6
 ssm-policy 2000
#
return

DeviceC configuration file

#
sysname DeviceC
#
multicast ipv6 routing-enable
#
acl ipv6 number 2000
 rule 0 permit source FF3E::1/64
#
interface GigabitEthernet0/1/0
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:4::2/64
 pim ipv6 sm
 ospfv3 1 area 0.0.0.0
#
interface GigabitEthernet0/1/8
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:8::1/64
 pim ipv6 sm
 mld enable
 ospfv3 1 area 0.0.0.0
#
ospfv3 1
 router-id 3.3.3.3
 area 0.0.0.0
#
pim-ipv6
 ssm-policy 2000
#
return

DeviceD configuration file

#
sysname DeviceD
#
multicast ipv6 routing-enable
#
acl ipv6 number 2000
 rule 0 permit source FF3E::1/64
#
acl ipv6 number 2001
 rule 0 permit source FF0E::1/64
#
interface GigabitEthernet0/1/0
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:2::2/64
 pim ipv6 sm
 ospfv3 1 area 0.0.0.0
#
interface GigabitEthernet0/1/8
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:3::2/64
 pim ipv6 sm
 ospfv3 1 area 0.0.0.0
#
interface GigabitEthernet0/1/16
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:4::1/64
 pim ipv6 sm
 ospfv3 1 area 0.0.0.0
#
ospfv3 1
 router-id 4.4.4.4
 area 0.0.0.0
#
pim-ipv6
 ssm-policy 2000
 c-bsr 2001:db8:3::2
 c-rp 2001:db8:3::2 group-policy 2001
#
return